Saint Sebastian was an early Christian saint and martyr. According to Christian belief, he was killed during the Roman emperor Diocletian's persecution of Christians. He is commonly depicted in art and literature tied to a post or tree and...

Arius was an ascetic Christian presbyter of Libyan origins, and priest in Alexandria, Egypt, of the church of Baucalis. His teachings about the nature of the Godhead, which emphasized the Father's divinity over the Son, and his opposition t...

Eusebius of Caesarea was a bishop of Caesarea in Palaestina and is often referred to as the father of Church history because of his work in recording the history of the early Christian church and forging unity among proto-orthodox advocates...

Saint Nicholas is the canonical and most popular name for Nicholas of Myra, a saint and Greek Bishop of Myra (Demre, in Lycia, part of modern-day Turkey). Because of the many miracles attributed to his intercession, he is also known as Nich...

Constantine, The Great was the 57th Emperor of the Roman Empire from 306, and the sole holder of that office from 324 until his death in 337. Best known for being the first Christian Roman emperor, Constantine reversed the persecutions of h...

Saint George, according to legend, was a Roman soldier of Greek origin and officer in the Guard of Roman emperor Diocletian, who was sentenced to death for failing to recant his Christian faith. As a Christian martyr, he later became one of...

Saint Lucy, also known as Saint Lucia, was a wealthy young Christian martyr who is venerated as a saint by Roman Catholic, Anglican, Lutheran, and Orthodox Christians. Her feast day in the West is 13 December; with a name derived from lux,...

Saint Vincent of Saragossa, also known as Vincent Martyr, Vincent of Huesca or Vincent the Deacon, the Protomartyr of Spain, was a deacon of the Church of Saragossa. He is the patron saint of Lisbon and Valencia. His feast day is 22 January...

Martin of Tours was Bishop of Tours, whose shrine in France became a famous stopping-point for pilgrims on the road to Santiago de Compostela in Spain. Around his name much legendary material accrued, and he has become one of the most famil...

The Council of Nicea convened on May 20, 325 A.D. The 230 church leaders were there to consider a question vital to the church: Was Jesus Christ equal to God the Father or was he something else? Athanasius, only in his twenties, came to the...

The emperor Flavius Claudius Julianus reigned from 360 to 26 June 363, when he was killed fighting against the Persians. Despite his short rule, his emperorship was pivotal in the development of the history of the later Roman empire. Julian...

Aurelius Ambrosius, better known in English as Saint Ambrose, was a bishop of Milan who became one of the most influential ecclesiastical figures of the 4th century. He was one of the four original doctors of the Church. According to legend...

Theodosius also called Theodosius I and Theodosius the Great, was Roman Emperor from 379 to 395. Reuniting the eastern and western portions of the empire, Theodosius was the last emperor of both the Eastern and Western Roman Empire. After h...

Saint Jerome was an Illyrian Latin Christian priest, confessor, theologian and historian, who also became a Doctor of the Church. He was the son of Eusebius, of the city of Stridon, on the border of Dalmatia and Pannonia. He is best known f...

He was named the Christian bishop of Hippo (Annaba, Algeria) in 396, and devoted the remaining decades of his life to the formation of an ascetic religious community. Augustine argued against the skeptics that genuine human knowledge can be...